Whenever I plug in laptop power supply, screen goes black for 15 sec

And same when I take it out... It's a fairly new HP laptop too. What could be causing this?
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More about whenever plug laptop power supply screen black
  1. Has it always done this?
  2. popatim said:
    Has it always done this?

    Yes, I got it refurbished a couple of days ago, it seems to be fine otherwise... Here, i recorded it: http://www.youtube.com/watch?v=2whYE_Ez5pQ

    It has a dedicated 1gb Mobility Radeon 4250 card
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